Relief-valve.



No. 730,167.'y

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No. 730,167. v l

UNITED STATES l'.Patented une 2, 1903. PATENT .OEEICE FRANK SCHREIDT, OF MANSFIELD, OHIO.

RELIEF-VALVE.

SPECIFICATION forming part of Letters Patent No. 730,167, dated June 2, 1903. Application filed January 5 1903. ,Serial No. 137,819. (No moel To all whom it may concern.:

Be it known that I, FRANK SCHEEIDT, a citizen of the UnitedStates of America, and a resident of Mansfield, county of Richland, State of Ohio, have invented certain new and useful Improvements in .Relief-Valves, of which the following is a specification. l My invention relates to relief-valves' especially adapted for use in locomotive-engines. Its object -is a spring-loaded valve in which the spring is protected from cinders and water, which occupies little space, and in which the relief-valves at opposite ends of the engine-cylinder may be opened simultaneously by-hand at one operation.' This object is attained by the means described in the specification and illustrated in the accompanying drawings, in which- Figure 1 shows in side elevation the bottom of a locomotive-engine cylinder and relier`V valves attached to the under side thereof, one of the relief-valves being in elevation and the other being in central section. Fig. 2 is an inverted plan view of one of the reliefvalves. Fig. 3 is aperspective view, upon an enlarged scale, of the hand-operated valve. Fig. 4 is a sectional view of a modiied form of valve. Fig. 5 is an' end view of the handvalve. Fig. 6 is a sectional View of the valvecasing, taken upon line/U oof Fig. 4.

Referring to Fig. l, the valve-casing A has a lateral annular flange a, interiorly screwthreaded to receive a cylindrical shell B, which is screwed into the flange a, projecting into the interior of casing A, and having` a lateral i'lange b upon one side, beveled upon its interior edge to form valve-seat b. Shell B is internally screw-threaded at its upper end to engage an externally-threaded coupling c, which extends into the boiler C at the under side of each of its ends. Valve-casing A- has an internal annular flange a', and its upper end is internally screw-threaded to engage the internally-screw-threaded annular {iange d of cap D. Between ilange a' and cap D valve-casing A has upon its under side perforations a2. Valve E is in the shape of a cup, with its lower edge beveled to iit valveseat b, its annular sides contacting fiange a and extending into ange d, engaging the same snugly, so as to prevent the entrance of water, cinders, or dust between the flange `and the valve. Within valve E and bearing against the bottom of the valve and the cap Dis a coiled spring F, the tension of which may bey regulated by screwing cap D into the valve-casing. Vhen the desired tension is obtained, the cap D is held in position by a cotter-pin d', passing down through perforations in the cap into the perforations d3 in the external iiange a4 at the end of the valve-cas.- ing A. Flange a divides valve-casing A into chambers a5 as. In thebottom of chamber ai valve-casing A has a series of perforations a7 encircling a reduced cylindrical downward extension as of the valve-casing. Shell B has in its lower end a central perforation beveled upon its edge to form a seat b2 for the handn operated valve G, which has wings g to guide it to its seat, and the stem g'- of valve G'extends down into'the extension d8 and rests upon a horizontal hand-bar H, which extends through vertical slots a9 in the extension a8 and which is tapered upon its end h, so that when the bar H is reciprocated by hand valves G in the valve-casings at the ends of the cylinders are simultaneously raised or lowered. Upon the interior of shell B above valve G is a stud g2, projecting beyond the edge of valve G to limit its upward movement, so as to prevent its being thrown out of its ways.

In operation spring F holds valve E to its seat b', and the pressure of steam in the boiler holds valve G to its seat when the rod H occupies its normal position-that is,itsextreme right-hand positiolnlooking at Fig. l. Should the pressure in either end of the cylinder C exceed the limit at which spring F is set,

valve E is raised from its seat and the pressure is relieved through perforations o7. All ordinary excess in pressure is thus relieved, but should there be an over-excess in pressure, as from an accumulation of water in either end of the cylinder, the excessive pressure would -carryvalve E back of ange a', lthus throwing both chambers a5 and a6 into communication with the interior of the cylinder, and the excessive pressure and the accumulation of water would escape through both perforations d7 and perforations a2. Cup E, engaging flange d snugly, it is seen that at IOO all times the springF is entirely protected does not become clogged or corroded thereby. Should it be desired at any time to relieve the pressure in the cylinder-as, for instance, to draw oli. any steam that might remain in the same after the engine has been shut down and to allow any water that may be therein to escape, and before starting up the enginethe same may be opened up by a single push upon rod II, which would raise both of the valves G.

In Fig. et I have illustrated a modified form of valve, wherein shell B is omitted. Valvecasing A has a lateral extension d10, internally screw-threaded to engage coupling c, and an internal annular flange beveled upon its edge to form valve-seat au. Between the flange a and cap D, valve-casing A has perforations am upon the under side. Valve E is of the same shape and extends into flange d of the cap D and is held to its seat by a spring F in the same manner as aforedescribed. The valve -easing A has wings um to guide the valve to and from its seat. The valve-casing has an extension as, and a valve-seat a is formed at its upper edge for the valve G, which is operated by a hand-bar II in the manner aforedescribed. In operation when the pressure within the cylinder exceeds the tension at which the spring F has been set, the valve E is raised from its seat and the excessive pressure is relieved through perforations (L12. In this form, likewise, the cup-valve extends into flange d, of cap D and protects the spring F at all times from cinders and water. The valvecasings A being parallel to the cylinder C, it is seen that they occupy comparatively little space, and their positions likewise render it possible to aetuate the two hand-valves at one operation.

I have shown my invention in the best form known to me, but it is obvious that many mere mechanical changes might be made therein without departing from the spirit or scope of my invention.

l. In a relief-valve the combination of a valve-casinghaving a chamber to be placed in communication with the interior of a cylinder, and a second chamber in communication with the atmosphere, a valve for controlling the communication of the chambers, one with the other, having annular walls forming a substantially cup-shaped valve, a flange upon the interior of the secondary chamber to contact the valve and forming with the walls of the valve a closed chamber, a spring-seat withinthe closed chamber for holding the valve to its seat, substantially as shown and described.

2. In a relief-valve the combination of a valve-Casin having a chamber to be placed in communication with the interior of a cylinder, and a secondary chamber in communication with the atmosphere, a valve for controlling the communication of the chambers, one with the other, having annular walls forming a substantially cup-shaped valve, a flange upon the interior ofthe second chamber to contact the valve and f'orming with the walls ol the valve a closed chamber, a spring within the closed chamber for holding the valve to its seat, an extension upon the under side of' the first chamber, a hand-operated valve seated in the walls oi' the first chamber and having a valve-stem extending into the extension, and a hand-bar for contacting the end of' the valve-stem, substantially as shown and described.

3. In a relief-valve the combination of a casing having a lateral extension to be secured to the side of a cylinder so that the valve-casing stands substantially parallel to the cylinder, and having an internal `projection dividing the casing into two chambers, the first in communication with the interior of the cylinder, the second in communication with the atmosphere, the projection being beveled to form a valve-seat and a springloaded valve for controlling the communication between the two chambers, substantially as shown and described.

4. In a relief-valve the combination of a valve-casing having a lateral internal screwthreaded extension, a shell closed at one end and internally screw-threaded at the other end to be secured to the side of the cylinder engaging the extension and lprojecting into the casing and having a valve-seat upon its inner end, an internal flange. upon the valveeasing dividing the easing into two chambers, perforations in the walls of each chamber, a valve seated against the seat in the shell and contacting the internal flange, and a spring for holding the valve to its seat, substantially as shown and described.

5. In a relief-valve the combination of a valve-casing closed at one end and open at the other, having upon one side and near its closed end a lateral internally-screw-threaded extension and upon its interiora fiange dividing it into two chambers, perf'orations in the walls of the chambers, a shell closed at one end and open at the other end, to be secured to a cylinder at its open end, and engaging the lateral extension of the valve-casing and extending into the easing and having a valve-seat upon one side, a cup-shaped valve seated against the valve-seat and contacting the internal flange of the casing, a cap seated in the open end of the valve-casing and having an internal flange to contact the walls of the valve forming therewith a closed chamber and a spring within the closed chamber for holding the valve to its seat, substantially as shown and described.

FRANK SCHREIDT.

Vitnesses:

F. H. BoGAnDUs, CHAs. E. SCHREIDT.

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